Hydrochloric Acid → trans-N-(6,7-Dichloro-2,3,4,14b-tetrahydro-1H-dibenzo[b,f]pyrido[1,2-d][1,4]oxazepin-1-yl)acetamide

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Reaction Steps

To a solution of trans-N-(7-chloro-2,3,4,14b-tetrahydro-1H-dibenzo[b,f]-pyrido[1,2-d][1,4]oxazepin1-yl)acetamide (Structure 12 of Scheme II, where R1=H, R2=H, R3=Cl, R4=R5=H, R15=CH3, X=O) (0.63 g, 1.84 mmol) in acetone (15 mL) were added N-chlorosuccinimide (246 mg, 1.84 mmol) and 6N (aq) HCl (3.1 mL). The resulting suspension was stirred at room temperature for 20 h. A second amount of N-chlorosuccinimide (246 mg, 1.84 mmol) was added and subsequently the reaction mixture was stirred at room temperature for 4 h. The reaction mixture was extracted with ethyl acetate (3×), washed with sat. (aq) NaHCO3 (3×), 10% (aq) NaCl (2×) and dried (Na2SO4). The solvents were removed under reduced pressure. The solid was purified by column chromatography (silicagel, toluene/ethanol=9/1). Subsequent purification by HPLC resulted in the title compound (137 mg, 36.4%). Data: 1H-NMR (400 MHz, CDCl3) 1.55 (m, 1H), 1.82 (m, 2H), 1.94-2.20 (m, 1H), 2.10 (s, 3H), 2.92 (m, 1H), 3.11 (td, J=12.6, 4.2, 1H), 4.39 (d, J=1.9, 1H), 4.86 (m, 1H), 7.02-7.36 (m, 6 ArH).

Provenance & Evidence